or if it is already added, the updates should become available via your preferred update method.

The PPA can be added manually in the Konsole terminal with the command:

sudo add-apt-repository ppa:kubuntu-ppa/backports

and packages then updated with

sudo apt updatesudo apt full-upgrade

Upgrade notes:

~ The Kubuntu backports PPA already contains from previous updates backported KDE PIM 16.12.3 packages (Kmail, Kontact, Korganiser Akregator etc), plus various other backported applications, so please be aware that enabling the backports PPA for the 1st time and doing a full upgrade will result in a substantial amount of upgraded packages in addition to Plasma 5.10.

~ While we believe that these packages represent a beneficial and stable update, please bear in mind that they have not been tested as comprehensively as those in the main ubuntu archive, and are supported only on a limited and informal basis. Should any issues occur, please provide feedback on our mailing list [1], IRC [2], file a bug against our PPA packages [3], or optionally contact us via social media.